In DxO's lab testing, I think that stuff held up a 20 pound bowling ball for 20 minutes before finally giving upSuppose DXO finds that Canon's L-tape tape has a light transmission coefficient of 1%, and they give the tape a score of 86%. Then Nikon invents a piece of piece with a transmission coefficient of 0.95%, and they get a score of 96%. Imagine the howls...
I was going to buy a 5D mk III but Im wondering now if I should wait because they'll probably release EF Black Tape L USM II soon and I don't fancy the resale value of the MK III's current kit tape: the EF Black Tape L USM I. And I heard a rumor they might release EF Slightly Blacker Tape L USM in June.
Note: USM in this case stands for Ultra Sticky Material